About Time, Volume 3: The Unauthorized Guide to Doctor Who (Seasons 7 to 11), by Tat Wood. I'm reading these as I watch classic Who for the first time.
These are very detailed, well-researched books, going into behind-the-scenes stuff, lore, etc.
Random Walk, by Rachel Lulick. Bought this directly from the author at a local book store. It's in a sub-genre I love: astronauts in trouble. I'm only a couple chapters in, and so far it's big on well-researched details (the author has some background in...something related - I can't remember), but not big on characterization. It reads like the script for a movie. None of that is a knock; I'm enjoying it so far, but things had better get interesting soon.
The cover design is not great, but the image used in the design is good, and wraps all the way around nicely. I worked in book cover design for a while, and I know self-published books when I see them.